Rotary compressor for compressing refrigerant using cylinder

• US 10,563,655 B2
• Filed: 11/07/2017
• Issued: 02/18/2020
• Est. Priority Date: 11/14/2016
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: Yahaba, Shingo, Inoue, Akira, Ueda, Kenshi, Izumi, Yasuyuki
• Primary Examiner(s): Trieu, Theresa
• Application Number:
  US15/806,193
• Publication Number:
  US 20180135630A1
• Time in Patent Office: 833 Days
• Field of Search: 418 11, 418 60, 418 63
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 18/3568 with axially movable vanes
• CPC Class Codes: F04C 2240/809 Lubricant sump
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 27/005 Axial sealings for working fluid
• CPC Class Codes: F04C 29/028 Means for improving or restricting lubricant flow
• CPC Class Codes: F04C 29/12 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Abstract

In a rotary compressor, a refrigerant path hole communicates with a lower discharge chamber concave portion while at least a part thereof overlaps the lower discharge chamber concave portion, is positioned between a lower vane groove and a first insertion hole in a lower cylinder, and is configured of a plurality of holes which are disposed between the upper vane groove and the first insertion hole in the upper cylinder, and a sectional area of a cross section which is closest to the lower vane groove and the upper vane groove of the plurality of holes is the smallest compared to the sectional area of the cross section of the other holes.

Claims

1. A rotary compressor which includes a sealed vertically-placed cylindrical compressor housing which is provided with a discharge pipe that discharges a refrigerant in an upper portion of the compressor housing, which is provided with an upper inlet pipe and a lower inlet pipe that suction the refrigerant in a lower portion of a side surface of the compressor housing, an accumulator which is connected to the upper inlet pipe and the lower inlet pipe that are fixed to a side portion of the compressor housing, a motor which is disposed in the compressor housing, and a compressing unit which is disposed below the motor in the compressor housing, is driven by the motor, suctions and compresses the refrigerant from the accumulator via the upper inlet pipe and the lower inlet pipe, and discharges the refrigerant from the discharge pipe, and in which the compressing unit includes an annular upper cylinder and an annular lower cylinder, an upper end plate which blocks an upper side of the upper cylinder and a lower end plate which blocks a lower side of the lower cylinder, an intermediate partition plate which is disposed between the upper cylinder and the lower cylinder and blocks the lower side of the upper cylinder and the upper side of the lower cylinder, a rotation shaft which is supported by a main bearing unit provided on the upper end plate and a sub-bearing unit provided on the lower end plate, and is rotated by the motor, an upper eccentric portion and a lower eccentric portion which are provided with a phase difference from each other in a rotation shaft, an upper piston which is fitted to the upper eccentric portion, revolves along an inner circumferential surface of the upper cylinder, and forms an upper cylinder chamber in the upper cylinder, a lower piston which is fitted to the lower eccentric portion, revolves along an inner circumferential surface of the lower cylinder, and forms a lower cylinder chamber in the lower cylinder, an upper vane which protrudes from an upper vane groove provided in the upper cylinder in the upper cylinder chamber, abuts against the upper piston, and divides the upper cylinder chamber into an upper inlet chamber and an upper compression chamber, a lower vane which protrudes from a lower vane groove provided in the lower cylinder in the lower cylinder chamber, abuts against the lower piston, and divides the lower cylinder chamber into a lower inlet chamber and a lower compression chamber, an upper end plate cover which covers the upper end plate, forms an upper end plate cover chamber between the upper end plate and the upper end plate cover, and has an upper end plate cover discharge hole that allows the upper end plate cover chamber and the inside of the compressor housing to communicate with each other, a lower end plate cover which covers the lower end plate and forms a lower end plate cover chamber between the lower end plate and the lower end plate cover, an upper discharge hole which is provided on the upper end plate and allows the upper compression chamber and the upper end plate cover chamber to communicate with each other, a lower discharge hole which is provided on the lower end plate and allows the lower compression chamber and the lower end plate cover chamber to communicate with each other, and a refrigerant path hole which penetrates the lower end plate, the lower cylinder, the intermediate partition plate, the upper cylinder, and the upper end plate, and communicates with the lower end plate cover chamber and the upper end plate cover chamber, the compressor comprising:

an upper discharge valve which opens and closes the upper discharge hole;

a lower discharge valve which opens and closes the lower discharge hole;

an upper discharge valve accommodation concave portion which is provided on the upper end plate and extends in a shape of a groove from a position of the upper discharge hole; and

a lower discharge valve accommodation concave portion which is provided on the lower end plate and extends in a shape of a groove from a position of the lower discharge hole,

wherein the lower end plate cover is formed in a plate shape,

wherein a lower discharge chamber concave portion is formed on the lower end plate to overlap the lower discharge hole side of the lower discharge valve accommodation concave portion,

wherein the lower end plate cover chamber is configured of the lower discharge chamber concave portion and the lower discharge valve accommodation concave portion,

wherein the lower discharge chamber concave portion is, in the lower end plate, formed within a fan-like range between straight lines that link a center of a first insertion hole and a center of a second insertion hole which are adjacent to each other among a plurality of insertion holes into which a fastening member that fastens the lower end plate cover, the lower end plate, the lower cylinder, the intermediate partition plate, the upper cylinder, the upper end plate, and the upper end plate cover is inserted and which are provided on a circumference around a rotation shaft to penetrate the lower end plate, the lower cylinder, the intermediate partition plate, the upper cylinder, and the upper end plate, and the center of the sub-bearing unit,

wherein the refrigerant path hole is configured of a plurality of holes which communicate with the lower discharge chamber concave portion while at least a part thereof overlaps the lower discharge chamber concave portion, are positioned between the lower vane groove and the first insertion hole in the lower cylinder, and are positioned between the upper vane groove and the first insertion hole in the upper cylinder, and

wherein sectional areas of cross sections of holes which are the closest to the lower vane groove and the upper vane groove in the plurality of holes are less than the sectional areas of cross sections of other holes,

wherein the sectional areas of each of the cross sections of the plurality of holes have a maximum size that does not interfere with other mechanical elements in each of the lower end plate, the lower cylinder, the intermediate partition plate, the upper cylinder, and the upper end plate, and

wherein, in the lower cylinder, total sectional area of the cross sections of a lower cylinder first circular hole and a lower cylinder second circular hole has a maximum size that does not interfere with the lower vane groove which is another mechanical element of the lower cylinder.

2. The rotary compressor according to claim 1, wherein each of the plurality of holes is a circular hole.